JPH0455941B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a container lid with a safe opening edge and a method for manufacturing the same, and more particularly, it is applied to various containers that are opened with a tear-off tab. The present invention relates to a container lid in which both the opening edge remaining on the seaming side and one side of the opening are configured to be safe after opening, and a manufacturing process thereof.

[Prior Art] There are many food and soft drink containers on the market that are opened by tearing a tearing guide line formed on the container lid using a tearing tab.

In this type of container lid, after opening, the opening edge on one side of the opening and the side that is tightened to the container body remain sharp, so that when the user takes out the contents of the container or removes food or soft drinks from the container. It may injure the skin when eating or drinking, and it can be extremely dangerous if the removed opening piece is left unattended. Generally, aluminum, its alloys, or surface-treated steel sheets such as tinplate and stain-free steel are used as lid materials, but the latter material is said to be particularly dangerous.

Therefore, in order to ensure that the opening edge portion remains in a safe form after opening the container lid, various ideas have been devised (Japanese Utility Model Publication No. 58-40032, Japanese Unexamined Patent Publication No. 60-204452). 59-60993], JP-A-62-
64729 [Patent Application 1985-198569], etc.).

For example, Japanese Patent Application Laid-Open No. 60-204452 [Patent Application No. 59-60993]
The main part of the container lid is shown in FIG. 10, in which a loop part 102 is formed on the outside of the tear guide line 101, and a return part 103 of the loop part 102 to the tear guide line 101 side is used as the tear guide line. The tearing tab 104 is slightly protruded inward from the line 101 (protrusion amount: Z1), and the tearing tab 104 is placed on the opening piece 105 side so that the tip claw part of the tearing tab 104 is placed on the tearing guide line 101. It is installed. According to this container lid, when the opening piece 105 is removed along the tearing guide line 101 with the tearing tab 104, the seaming side plate surface 1
The tearing part 101 remaining at 06 is the return part 103.
The opening edge will be configured in a safe manner.

On the other hand, the main part of the container lid disclosed in Japanese Patent Application No. 1985-1985 is shown in FIG. (level difference: Z2), a tearing guide line 109 is formed on the rising part on the outer peripheral side, and the tip claw part of the tearing tab 110 is placed above the tearing guide line 109. The same tab 110 is attached to one side of the opening so that it can be placed thereon. According to this container lid, when the opening piece 107 is removed along the tearing guide line 109 with the tearing tab 110, the tearing part on the side of the opening piece 107 is connected to the bent part of the raised wall 108. The opening edge will remain in close contact between the inner risers and configured in a secure configuration.

Further, Japanese Utility Model Publication No. 58-40032 also provides a technique for configuring the opening edge on the seaming side or one side of the opening in a safe form.

[Problems to be Solved by the Invention] By the way, each of the above-mentioned inventions and devices is configured so that the opening edge on the seaming side or the opening edge on one side of the opening is made safe, but both opening edges are made safe. It is not something that will become.

Additionally, this type of container lid may also be applied to containers for storing flammable liquids and the like. recently,
The Fire Service Act requires a drop test for storage containers for flammable liquids, and stipulates that they must have sufficient strength to withstand the impact of a fall. If it splits, it will not pass the test. this is,
The same applies to containers for ordinary soft drinks, etc. In any case, the split portion of the container lid must have a structure that can sufficiently withstand the impact internal pressure generated when the container is dropped.

Furthermore, regarding the manufacturing problems of container lids,
After the container lid is molded to prevent rust, the surface is coated with a repair varnish, but it is especially necessary that the repair varnish be applied completely to the part where the tear guide line has been applied. . As mentioned above, it is good to form a loop part or a bent raised wall to safely construct the opening edge, but if the tear guide line is not coated with repair varnish, it cannot be used as a lid for a beverage or food container. It disappears.

Therefore, the present invention was created with the object of providing a container lid that rationally solves the problems of safety and impact resistance of the opening edge and the application of repair varnish.

[Means for Solving the Problems] The container lid according to the first invention forms a loop portion bent upward from the forming surface of the tear guide line on the outside of the tear guide line that partitions the opening piece, The return portion of the loop portion toward the tearing guide line is separated from the forming surface of the tearing guide wire, and the return portion is bent further outward from the tearing guide line on the side of the lid plate on the seaming side. , a loop portion bent downward from the tearing guide wire forming surface is formed inside the tearing guide wire, and a return portion of the loop portion toward the tearing guide wire side is formed on the tearing guide wire forming surface. It consists of a lid plate surface on one side of the opening which is bent further inward outside the tearing guide line, and the tip claw of the tearing tab is located at or near the tearing guide line. The present invention relates to a container lid with a safe opening edge in which the tearing tab is attached to a portion corresponding to the opening piece.

Further, the second invention provides a method for manufacturing the container lid as described above, in which the deep drawn wall portion of the base plate is deep drawn to define a portion corresponding to the opening piece to form a tapered deep drawn wall portion. a first step of forming a three-step stepped wall; a second step of buckling the lowest wall portion of the stepped wall portion in an S-shape inside the second horizontal portion; and the S-shaped portion. and a third step of forming a tearing guide line on the continuous surface part of the second level horizontal part, and buckling the middle wall part of the stepped wall part inside the top wall part, and separating the buckled part and the first stage wall part. The fourth step is to further compress the S-shaped portion formed in the third step while forming an S-shaped portion with the horizontal portion, and the tip claw portion of the tearing tab is formed in the third step. and a fifth step of attaching the tearing tab to a portion corresponding to the opening piece by positioning the tearing tab at or near the inner side of the tearing guide line.

[Operation] In the container lid of the first invention, when the opening piece is removed by tearing along the tearing guide line with the tearing tab, the opening edge on the seaming side is located outside the tearing guide line. The opening edge on one side of the opening is located inside the return portion of the loop formed inside the tearing guide line, so that both The opening edges are located outside and inside the curved surfaces from each return portion, respectively, to ensure safety.

In addition, in the state before tearing, the tearing guide line is located at the center of the S-shaped part made up of both loop parts, so even if the container falls and an impactful internal pressure builds up on the container lid. The S-shaped portion absorbs impact energy and prevents the tearing guide wire from tearing.
In addition, when tearing with the tearing tab (pop tear), work hardening occurs in both loops when forming both loops on the material plate, so the tearing guide wire does not tear. It can be done extremely smoothly.

Furthermore, since the return portions of both loop portions are separated from the forming surface of the tear guide wire, if repair varnish is sprayed after forming the container lid, the repair varnish will easily flow from each separated portion into the loop portion. invade,
The repair varnish will be completely applied to both sides of the forming surface of the tear guide line.

The second invention provides a container lid according to the first invention by performing five steps of processing on a base plate in which a tapered deep-drawn wall portion is formed by deep drawing processing to define a portion corresponding to the opening piece. Relating to a method of manufacturing.

The first step is a step of making preparations for forming loop portions on the lid plate surface on the seaming side and the lid plate surface on one side of the opening in the second and subsequent steps.

The second step corresponds to a preliminary step for forming a loop portion on the surface of the lid plate on one side of the opening in the lowermost wall portion.

The third step is a step of forming a tearing guide line,
By setting the forming position to the continuous surface of the S-shaped part preformed in the second step and the second horizontal part, the two loop parts formed in the next third and fourth steps A tear guide line can be located in the continuous section. It should be noted that various methods can be used to form the tearing guide line, such as a method using ordinary stamping or a method using a special forming means (Patent No. 1062741).

The fourth step is to form a loop part on the seaming side cover plate surface on the middle wall part above the tearing guide line, and to further compress the S-shaped part formed in the second step to form the tearing guide line. This corresponds to the step of making the loop portion bulge out on the lower side of the .

The fifth step corresponds to the step of attaching the tear-off tab.

[Example] Hereinafter, an example of the present invention will be described using FIGS. 1 to 9.

FIG. 1 is a cross-sectional view of the main parts of the container with the container lid attached to the container according to the present embodiment, and FIG. 2 is a perspective view of the external appearance of the container with the container lid attached.
(Figure 1 shows a part of the cross section taken along the line X--X in Figure 2).

In Fig. 1, 1 is a tear guide line, and the plate surface continuous to the outside of the tear guide line 1 corresponds to the lid plate surface on the seaming side, and the plate surface continuous to the inside. corresponds to the cover plate surface on one side of the opening.

The lid plate surface on the seaming side has the following structure.

First, on the outside of the tear guide wire 1 and above the forming surface 2 of the guide wire 1, a loop portion 3 is formed by bending the plate surface, and the tear guide wire 1 of the loop portion 3 is formed by bending the plate surface. The lateral return portion 4 is spaced apart from the forming surface 2 of the tearing guide line 1. That is, a gap 5 having a distance A is formed between the return portion 4 and the forming surface 2 of the tearing guide line 1.

Further, the return portion 4 is bent outward from the position of the tear guide line 1, and the extended portion of the bent plate surface is wrapped around the container 6 (7:
seaming part). That is, the return portion 4 protrudes inward from the position of the tearing guide line 1 by a distance B.

On the other hand, the cover plate surface on one side of the opening has the following structure.

First, a loop portion 8 formed by bending the plate surface is formed inside the tear guide wire 1 and below the forming surface 2 of the guide wire 1, and the tear guide wire of the loop portion 8 is formed by bending the plate surface. The return portion 9 to the first side is spaced apart from the forming surface 2 of the tearing guide line 1 . That is, a gap 10 having a distance C is formed between the return portion 9 and the forming surface 2 of the tearing guide line 1.

Further, the return portion 9 is bent inward on the outside of the tearing guide line 1, and the plate surface of the bent extended portion corresponds to the central portion 11 of the opening piece. That is, the return portion 9 protrudes outward by a distance D from the position of the tearing guide line 1. still,
Since the return portion 9 is bent inward on the outside of the tearing guide line 1, a loop portion 13 is further formed at the bent portion, and the plate on the central portion 11 side of the opening piece in this loop It is desirable that a gap 14 also be created between the surface and the plate surface of the loop portion 8.

Furthermore, with respect to the lid plate surface on one side of the opening, a tearing tab 15 (indicated by a two-dot chain line in FIG. 1) has its tip claw located at or near the tearing guide line 1 or inside thereof. Installed in condition. This attachment is carried out by caulking the tear-off tab 15 to the central portion 11 of the opening piece, as shown in FIG.

A sectional view of the main part when the container lid having the above structure is opened is shown in FIG.

When the tearing tab 15 is pulled up in FIG. 2, the claw at the tip of the tab presses against a local part of the tearing guide line 1 in FIG. The tearing progresses along line 1, and the lid plate surface on one side of the opening is removed from the lid plate surface on the seaming side. In this case, as shown in FIG. 3, the return portion 9 follows the tearing guide line 1.
The cover plate surface on one side of the opening is pulled upward while the forming surface 2 of the tear guide wire 1 is brought into sliding contact with the return portion 4, but at this time, the tear portion 20 on the loop portion 3 side is removed from the return portion 4. The part 4 side is pressed, and the tearing part 21 on the loop part 8 side is pressed against the return part 9 side.

Therefore, each of the loop parts 3 and 8 is deformed by being slightly crushed, so that the tear part 20 approaches the outside of the return part 4 of the loop part 3, and the tear part 21 approaches the return part 4 of the loop part 8. 9, the container 6 is opened. Note that the distances B' and D' in FIG. 3 are the distance between the tear part 20 and the bulging end of the return part 4 after opening, and the distance between the tear part 21 and the bulge end of the return part 9, respectively. It shows.

As a result, the opening edge 22 remaining on the lid plate surface on the seaming side after opening and the opening edge 23 remaining on the lid plate surface on one side of the opening are located on the outside of the return portion 4 where the tearing portion 20 is a curved surface. The tearing part 21 is adjacent to the inside of the return part 9 which is a curved surface, and each opening edge 2
Safety is guaranteed even if you touch 2 and 23.

In addition, since the tearing guide wire 1 is configured between both the loop parts 3 and 8, both the loop parts 3 and 8 absorb the impact internal pressure, and when the container 6 falls, the tearing guide wire 1 Problems such as splitting can be resolved.

Next, a method of manufacturing the container lid by molding will be explained with reference to FIGS. 4 to 9.

First, a portion 51 corresponding to the opening piece as shown in FIG.
The deep drawn wall portion 5 of the base plate 53 is deep drawn to define a tapered deep drawn wall portion 52.
2, a three-step stepped wall portion 54 as shown in FIG. 5 is formed. This forming step is performed by plastically deforming the deep-drawn wall portion 52 into a step-like shape using a lower mold 55 and an upper mold 56 that form three step-like portions. Incidentally, in this step, the boss 57 for tab crimping is also punched out.

When the formation of the three-step stepped wall section 54 is completed, as shown in FIG.
Upper mold 6 that fits inside the uppermost wall 60 and the middle wall 61
2, the lowermost wall 63 is buckled in an S-shape by a lower mold 64 that receives the opening piece equivalent portion 51 and is fitted onto the lowermost wall 63. In this case, the buckled S-shaped portion 63a is restrained by the lower mold 64 and is therefore configured inside the second horizontal portion 59.

Next, as shown in FIG. 7, the processed workpiece is set in the annular lower mold 65a that fits over the S-shaped part 63a formed above, and the first horizontal part 58 and the second horizontal part 59 are while engaging with the uppermost wall portion 60
The annular upper mold 66a fitted into the middle wall part 61 holds down the second horizontal part 59 of the workpiece, and the annular upper mold 6
The second stage horizontal part 5 is formed by the movable upper mold 66b fitted inside the mold 6a.
9 and the S-shaped portion 63a, and then the movable lower mold 65b fitted in the annular lower mold 65a returns the shallowly drawn portion to the upper side and buckles it. As a result, the tearing guide line 1 is buckled in the continuous portion between the second horizontal portion 59 and the S-shaped portion 63a.

Next, as shown in FIG. 8, the processed intermediate body on which the tearing guide line 1 has been formed receives the opening piece equivalent portion 51 and the S-shaped portion 63a, and the uppermost wall portion 60 and the middle wall portion 61, and is fitted inside the uppermost wall part 60, and the first horizontal part 58
The middle wall portion 61 is buckled in an S-shape using an upper die 68 having a tapered portion 68a that engages with the upper die 68. In this case, the buckled S-shaped portion 69 is restrained by the lower mold 67 and is configured inside the first horizontal portion 58 . Furthermore, in this step, buckling occurs in the middle wall portion 61, and the S-shaped portion 63a formed above is further compressed, causing the tearing guide line 1 to move inward. That is, the return portion 4 of the buckled S-shaped portion 69 toward the tearing guide line 1 bulges inward from the tearing guide line 1, and the tearing guide line 1 of the compressed S-shaped portion 63a Return part 9 to the side
is in a state where it bulges outward from the tearing guide line 1.

Then, the processed body that has been formed as described above is finally transferred to a process for attaching tearing tabs 15.

This attachment process is shown in FIG. 9, in which the boss 57 of the workpiece is inserted into the tab crimping boss 57 and is attached to the lower die 70, which is provided with a rod 70a that is biased upward by a spring. The workpiece is positioned and set by inserting the rod 70a into the workpiece. Then, after inserting the boss 57 into the mounting hole of the tearing tab 15 and positioning the tip claw of the tearing tab 15 at or near the tearing guide line 1 of the workpiece, the crushing hammer 71a is lowered, the boss 57 is crushed with the crushing hammer 71a, and the tearing tab 15 is removed from the center part 1 of the opening piece.
Install it on 1.

In the container lid shown in FIGS. 1 and 2 formed as described above, since both the loop portions 3 and 8 are work-hardened during the bending process, tearing guides are formed as shown in FIG. 3. When opening along the line, both the pop value and the tear value become small, and it is sufficient to pull the tear-off tab 15 with a small force.

In addition, the container lid that has undergone all the processing steps with the tear-off tab 15 attached is sprayed with repair varnish to become the final product before seaming. As shown in Figure 9,
Gaps 5 and 10 are formed between the return portion 4 of the loop portion 3 and the forming surface 2 of the tearing guide wire 1, and between the return portion 9 of the loop portion 8 and the forming surface 2 of the tearing guide wire 1, respectively. Therefore, in the repair varnish application process, the repair varnish can be completely applied to the inside of each loop portion 3, 8 (including the front and back sides of the surface on which the tear guide line is formed).
Generally, a minimum gap of about 0.3 mm or more is required for the repair varnish to penetrate, but this can be easily achieved with the container lid of this embodiment.

[Effects of the Invention] With the above configuration, the present invention has the following effects.

Claim 1 [Container lid]: After opening the container, the opening edge remaining on the seaming side and the opening edge generated on one side of the opening can both be configured in an extremely safe form, and the opening edge on the container side and the opening piece arranged This completely eliminates the risk of injury due to

Since a buffer structure is adopted that prevents the impact force and pressure generated when the container is dropped or the like from directly acting on the tearing guide wire, it is possible to realize a container with strong impact resistance. In particular, by applying the present invention to containers for flammable liquids, it is possible to effectively prevent a situation where a container falls during an earthquake and causes a large fire.

Loops are formed above and below the surface where the tear guide line is formed, but by providing a gap, the repair varnish can be completely applied, and the repair varnish can be applied to the entire container lid using a general spraying method. can do.

Since both sides of the tearing guide line are comprised of loop portions that have a processing effect, the pop value and tear value at the time of opening are reduced, making opening easier.

Claim 2 [Manufacturing method]: Provides a rational means for forming the container lid in stages with a minimum number of steps, thereby ensuring mass productivity.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the main parts of the container lid according to the embodiment attached to the container, Fig. 2 is an external perspective view of the container to which the container lid is attached, and Fig. 3 is the opening of the container lid. 4 is a sectional view of the base plate, FIGS. 5 to 9 are sectional views showing the manufacturing process, and FIGS. 10 and 11 are sectional views of the conventional container lid attached to the container. FIG. DESCRIPTION OF SYMBOLS 1...Tearing guide line, 2...Tearing guide line forming surface, 3...Loop part, 4...Returning part 5...Gap, 6...Container, 7...Tightening part, 8... Loop part, 9... Return part, 10... Gap, 11... Center part of opening piece, 15... Tear-off tab, 2
0, 21...Cleft part, 22, 23...Opening edge,
A, C...interval, B, D...distance.

Claims (1)

[Claims] 1. A loop portion bent upward from the forming surface of the tear guide line is formed on the outside of the tear guide line that partitions the opening piece, and the loop portion returns to the tear guide line side. A lid plate surface on the seaming side in which the return portion is separated from the forming surface of the tearing guide line and further bent outward inside the tearing guide line, and a tearing guide is formed inside the tearing guide line. A loop portion is formed that is bent downward from the wire forming surface, and the return portion of the loop portion toward the tearing guide wire is separated from the tearing guide wire forming surface, and the return portion is bent downward from the tearing guide wire side. It consists of a cover plate surface on one side of the opening that is folded further inward from the outside of the line, and the tip claw of the tear-off tab is positioned at or near the tear guide line, and the tear-off tab is attached to a portion corresponding to the opening piece. Secure container lid with attached open rim. 2. A first step of forming a three-step stepped wall on the deep-drawn wall of the base plate, which has been deep-drawn to define a portion corresponding to the opening piece to form a tapered deep-drawn wall; and the step-like wall. a second step of buckling the lowermost wall part in the S-shape inside the second-stage horizontal part; and forming a tearing guide line in the continuous surface part of the S-shaped part and the second-stage horizontal part. a third step; and a third step in which the middle wall portion of the stepped wall portion is buckled inside the top wall portion and an S-shaped portion is formed by the buckled portion and the first horizontal portion; S that was done
A fourth step of further compressing the letter-shaped portion, and opening the tearing tab by positioning the tip claw portion of the tearing tab at or near the inside of the tearing guide line formed in the third step. A method for manufacturing a container lid with a safe opening edge, comprising a fifth step of attaching it to the corresponding part.